very cool question: learn some new tricks, and get 10 points, why not?!
Hint to spare the pain : string(NaN)==
Which doors are open?
Longest Divisor Run
Set the array elements whose value is 13 to 0
intersection of matrices
Apply Function to Each Field of a Structure Array: Part 1
Histogram of histogram
Moving Product (Easy)
Fast 1-D Convolution (full shape)
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